Xiaoqing Lin1, Longjie Ji2, Mingxiu Zhan 1,3, Lingshu Wang1, Tong Chen1, Shengyong Lu1, Xiaodong Li1, Jianhua Yan1


State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
National Engineering Laboratory for Site Remediation Technologies, Beijing Construction Engineering Group Environmental Remediation Co., Ltd., Beijing 100015, China
College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China



Received: February 24, 2018
Revised: March 18, 2018
Accepted: March 18, 2018
Download Citation: ||https://doi.org/10.4209/aaqr.2018.01.0023  


Cite this article:
Lin, X., Ji, L., Zhan, M., Wang, L., Chen, T., Lu, S., Li, X. and Yan, J. (2018). Suppression of PCDD/Fs by Raw Meal in Cement Kilns. Aerosol Air Qual. Res. 18: 1032-1043. https://doi.org/10.4209/aaqr.2018.01.0023


HIGHLIGHTS

  • Raw materials can suppress the formation of PCDD/Fs.
  • The best ratio of MSW and raw material for PCDD/F suppression is 1:15.
  • NaCl and CuCl2 have adverse effects on PCDD/F suppression.
  • MSW containing high levels of Cl and Cu is not good for co-processing.

ABSTRACT


Raw meal of the cement production process could probably suppress the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). In this study, these suppression effects were studied and compared during the co-processing of municipal solid waste (MSW) with conventional feed materials such as pure CaCO3, and pure CaO. A top suppression efficiency of 96% was achieved for a ratio of MSW to raw meal of 1:15. Moreover, NaCl and CuCl2 were added to the mix of feed material and MSW, to reveal the impact of additional chlorine and cations on PCDD/F formation. Similarly, the raw meal was mixed with the kiln dust to investigate possible suppression effects of those PCDD/Fs formed through the precursor or the de novo synthesis at a temperature of 350°C. The raw meal suppressed the formation of PCDD/Fs from kiln dust. Furthermore, the raw meal could not suppress the formation of PCDD/Fs on mixtures of kiln dust and NaCl or CuCl2, which could be associated with a potential increase in the formation effects of PCDD/Fs on the raw meal. The results can help in potential decision-making on the applicability of certain cement kilns on the co-processing of MSW containing high levels of Cl and Cu.


Keywords: PCDD/Fs; Cement kiln; Raw meal; Suppression; MSW co-processing.

 



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